Quantum computing is rapidly moving from academic experiments to real-world engineering applications. In early 2026, Google’s Quantum AI team made significant progress in breaking RSA encryption, drastically lowering the threshold for quantum attacks. At the same time, the Quantum Doomsday Clock now points to a critical juncture just two years away, when cryptographic systems may face real threats. As "Q-Day"—the moment when quantum computers become practically capable of breaking today’s encryption—shifts from theoretical speculation to a measurable time window, the blockchain industry faces its most severe security challenge since inception. In May 2026, the NEAR Protocol announced the launch of its post-quantum security upgrade, becoming the first mainstream Layer-1 blockchain to integrate a NIST-approved post-quantum signature scheme at the protocol level.
How Serious Is the Quantum Threat to Existing Cryptography?
Today, the vast majority of blockchain networks rely on elliptic curve digital signature algorithms (such as ECDSA and EdDSA) and the RSA algorithm. The security of these cryptographic systems is rooted in the computational difficulty of problems like large integer factorization and discrete logarithms. However, Shor’s quantum algorithm means that once quantum computers with sufficient qubits and error correction are deployed, these mathematical problems can be solved in polynomial time rather than requiring exponential time.
Industry estimates for "Q-Day" keep moving closer. According to the latest Quantum Doomsday Clock projections, breaking elliptic curve encryption will require about 1,600 to 2,300 logical qubits—a hardware threshold that is rapidly approaching. Analysis by Capriole Investments suggests that, without upgrades, quantum computers could break current cryptographic systems within 2 to 9 years, with a 4-to-5-year window being most likely. This timeline places the foundational security of crypto assets at the edge of a "quantum event horizon." For the blockchain industry—whose core values are decentralization and immutability—a compromised signature system would fundamentally undermine user authentication and asset ownership. This is a systemic risk that cannot be remedied after the fact.
Why Post-Quantum Cryptography Is a "Necessary Defense" for Layer-1
In the face of quantum threats, upgrading to post-quantum cryptography is not optional—it’s a necessary defense. The US National Institute of Standards and Technology (NIST) has completed the approval of the first batch of post-quantum cryptography standards, officially releasing FIPS-203, FIPS-204, and FIPS-205. These provide a concrete baseline for industry-wide transformation. Among them, FIPS-204—ML-DSA (Module Lattice Digital Signature Algorithm)—is a lattice-based digital signature scheme and the technical path NEAR has adopted for its upgrade.
For Layer-1 blockchains, post-quantum upgrades are far more complex than typical application-layer changes. Core modules such as consensus protocols, validator operations, block synchronization, transaction signatures, and cross-chain communication all require redesign. Any compatibility flaws or performance bottlenecks could undermine the network’s security foundation. More importantly, the upgrade cycle itself could take years—meaning deployment must be completed before "Q-Day" arrives, not in a last-minute rush. For Layer-1s, post-quantum cryptography is not just an algorithm swap; it’s a fundamental reinvention of the underlying infrastructure.
What Technical Elements Are Included in NEAR’s Post-Quantum Security Upgrade?
The Near One team plans to introduce a post-quantum secure signature scheme on the testnet by the end of Q2 2026, using FIPS-204 (ML-DSA) as the first post-quantum signature option. This scheme, based on a NIST-approved lattice signature system, aims to balance standardization and security. Unlike many blockchains that rely on single public key addresses, NEAR’s account model is "decoupled from cryptography": accounts are controlled via rotatable "access keys" rather than being permanently bound to a specific key pair. This means any NEAR account holder can rotate keys and migrate to the post-quantum signature scheme with a single transaction, without changing their account address or redeploying assets.
On the ecosystem front, NEAR is collaborating with wallet developers like Ledger to drive client compatibility for post-quantum signatures. NEAR’s chain signature MPC network currently supports threshold signatures for over 35 public blockchains. The Defuse team is developing quantum-secure cross-chain signature solutions for NEAR Intents users—so if other chains lag in migration, NEAR can still offer a quantum-safe environment for cross-chain interactions.
How Are Other Major Layer-1s Progressing Toward Quantum Resistance?
Beyond NEAR, other leading Layer-1 blockchains have also begun post-quantum initiatives, but progress varies significantly.
The Ethereum Foundation established the Post-Quantum Ethereum Resource Center in early 2026, setting a target for Layer-1 protocol-level quantum resistance by 2029. Over 10 client teams are participating in post-quantum devnet builds and testing, but a full execution layer migration is expected to take several more years. Ethereum faces the challenge of securely migrating hundreds of millions of accounts and managing the gas cost spike from post-quantum signatures—current ECDSA verification requires about 3,000 gas, while quantum-resistant schemes could increase this exponentially.
On Solana, the two major validator client teams, Anza and Firedancer, have independently implemented the Falcon post-quantum signature scheme, with code published on their respective GitHubs. The Solana ecosystem also features Blueshift’s Winternitz Vault, a quantum-resistant primitive based on one-time signatures, which has been running for over two years. However, the Solana Foundation has stated there is no immediate need to move these solutions into production; they remain "research-ready and deployable as needed."
Meanwhile, Bitcoin—the largest crypto network by asset value—also faces quantum risks due to its elliptic curve signature system. However, the community’s extreme decentralization and conservative approach to technical decisions have slowed progress toward quantum resistance.
A comparison of the above information can be summarized as follows:
| Dimension | NEAR | Ethereum | Solana | Bitcoin |
|---|---|---|---|---|
| Current Status | Testnet launch planned for 2026 Q2 | In research; aiming for 2029 L1 upgrade | Falcon code implemented; not in production | No system roadmap yet |
| Technical Path | FIPS-204 (ML-DSA) | SNARK + multi-scheme research | Falcon (post-quantum digital signature) | No clear standard |
| Account Model Advantage | Key rotation; accounts decoupled from cryptography | Complex EOA account migration | Traditional public/private key system | UTXO model requires full overhaul |
| Cross-Chain Collaboration | 35+ chain threshold signatures; quantum-safe cross-chain | Mainly intra-ecosystem migration | Limited cross-chain support | No native cross-chain |
| Ecosystem Participation | Collaborating with Ledger and others | 10+ client teams testing | Anza, Firedancer completed implementations | Highly debated; slow progress |
From this comparison, it’s clear that NEAR leads in three areas: its account model advantage, execution certainty (testnet in 2026 Q2), and ecosystem collaboration (wallets, cross-chain). Ethereum and Solana remain in research and testing phases.
Can the "Post-Quantum Narrative" Become a New Differentiator in the 2026 Public Chain Race?
The competitive landscape for Layer-1 blockchains in 2026 is undergoing a major paradigm shift. As transaction speeds and gas costs converge across most networks, pure performance is no longer a differentiator. The focus is shifting to three areas: value capture mechanisms, developer experience, and long-term security architecture.
Post-quantum security directly addresses the core issue of "long-term security architecture." For institutional investors, enterprise applications, and scenarios requiring long-term data attestation, the ability to complete security upgrades before quantum technology matures is becoming a key criterion for selecting foundational infrastructure. When there’s a clear roadmap for security upgrades, Layer-1s that implement post-quantum solutions first will gain an early advantage in trust and compliance.
Among mainstream Layer-1s, Ethereum’s 2029 target is relatively late, Solana’s solution is not yet in production, and NEAR’s testnet launch is set for Q2 2026—giving NEAR a clear lead in terms of timing. This first-mover advantage is not only technical and reputational but may also translate into greater market attention and capital allocation.
How Does NEAR’s "AI + Quantum Security" Dual Narrative Work Together?
NEAR stands out by occupying two major narrative tracks: AI infrastructure and quantum security. On the AI front, NEAR co-founder Illia Polosukhin co-authored the "Attention Is All You Need" paper, which laid the foundation for the Transformer architecture behind modern large language models. NEAR’s on-chain AI infrastructure and AI Agent Fund initiatives give the project a strong position in the AI-blockchain integration narrative.
The post-quantum security upgrade adds a second layer of differentiation for NEAR. As market discussions around "AI + blockchain" deepen, security is becoming even more critical for institutional applications—on-chain AI agent management, decentralized inference networks, and similar scenarios all depend on the security of the underlying signature system. By making both AI and quantum security central to its story, NEAR is building a "tech-forward + long-term security" composite positioning. This dual narrative creates a synergistic effect: the AI narrative drives attention and growth, while the post-quantum security narrative strengthens the foundation of trust. Together, they point in the same direction—NEAR is evolving from a smart contract platform into a comprehensive, future-ready infrastructure.
Conclusion
NEAR Protocol’s post-quantum security upgrade marks a substantive step forward for mainstream Layer-1 blockchains in addressing quantum computing threats. By adopting the NIST-approved FIPS-204 signature scheme and leveraging its account model architecture, NEAR leads the industry in testnet launch timing, technical feasibility, and ecosystem collaboration. While Ethereum and Solana have started planning, both face bottlenecks in execution and migration complexity. As quantum security shifts from "academic discussion" to "engineering reality," Layer-1s that build post-quantum capabilities first are likely to secure a stronger position in institutional applications and long-term trust evaluations. NEAR’s dual focus on AI and quantum security creates a distinctive narrative structure, which may become a unique differentiator in the Layer-1 competition of 2026.
Frequently Asked Questions (FAQ)
Q1: Which signature scheme is NEAR using for its post-quantum security upgrade?
NEAR plans to use FIPS-204 (ML-DSA), a lattice-based digital signature standard officially approved by NIST and formerly known as CRYSTALS-Dilithium.
Q2: When will the upgrade go live?
The testnet version is targeted for launch by the end of Q2 2026. After launch, any NEAR account holder can rotate their keys and switch to the post-quantum signature scheme with a single transaction.
Q3: Why is NEAR’s account model favorable for post-quantum migration?
NEAR accounts are decoupled from cryptography and controlled by rotatable "access keys" rather than being permanently bound to a single key pair. Users can switch signature schemes without changing their account address, greatly simplifying migration.
Q4: How are Ethereum and Solana progressing toward quantum resistance?
Ethereum has announced a target to complete Layer-1 protocol upgrades by 2029, with over 10 client teams participating in testing. Solana has completed initial Falcon implementation, but it is not yet in production.
Q5: Will the quantum security upgrade affect network throughput and transaction costs?
Post-quantum signatures have larger key sizes and require more computation for signature verification than existing schemes—a common challenge across the industry. NEAR is deploying on testnet to evaluate real-world impacts and will optimize accordingly based on test results.
